Multiple SQL injection vulnerabilities in the Tapatalk plugin 4.9.0 and earlier and 5.x through 5.2.1 for vBulletin allow remote attackers to execute arbitrary SQL commands via a crafted xmlrpc API request to (1) unsubscribe_forum.php or (2) unsubscribe_topic.php in mobiquo/functions/.

The Tapatalk (aka com.quoord.tapatalkpro.activity) application 4.8.0 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.